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hello its dr. day storms and I wanted to give a brief overview on drug screening and Confirmation methodology since I know that this can be confusing for an introductory forensic science class one of the very first things that we need to discuss really have to do with this idea of a screening test versus a confirmation test okay much like implies a screening test really is just a preliminary test that you use just to initially reduce the number of possible identities of an unknown substance so lets say you have a possible drug you not sure what it is you want to do something just to reduce that possibility down to a handful of drugs hopefully or if not fewer and then the confirmation test or confirmatory test is one that will specifically identify what that substance is most likely you may not have something a confirmation test within the field within the field you usually do a screening test but within the once you can take it back to the laboratory you can do a confirmation test o
